Function makeAdder(num addBy) => (num i) => addBy + i;

main() {
  var a = 5;
  var b;
  b ??= 6; //asign if null
  a ??= 6;
  print(a); //5
  print(b); //6

  a += 1;
  print(a); //6

  b *= 2;
  print(b); //12
}
//EOP
